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Ten sailors are missing after a US warship collided with an oil tanker east of Singapore, the US Navy said, the second accident involving US Navy destroyers in Asian waters in little more than two months.

The guided-missile destroyer USS John S. McCain collided with the merchant vessel Alnic MC before dawn while heading to Singapore for a routine port call, the Navy said in a statement.

“Initial reports indicate John S. McCain sustained damage to her port side aft,” the Navy said. “There are currently 10 sailors missing and five injured.”

Four of the injured were evacuated by helicopter to a hospital in Singapore with non-life threatening injuries, while the fifth needed no further treatment, it said.

A search-and-rescue mission was under way involving Singaporean ships, helicopters and tug boats, as well as US Navy aircraft.

Malaysian authorities said the collision happened in Malaysian waters in the South China Sea and that they were assisting in the search-and-rescue operation. Images released by Malaysia’s navy showed the USS John S. McCain with a large dent around the waterline.

The warship was currently sailing under its own power towards Singapore’s Changi Naval Base and there was no sign of fuel or oil visible near the ship, the Navy said.

The Alnic MC is a Liberian-flagged, 183 metre-long oil or chemical tanker of 50,760 deadweight tonnes, according to shipping data in Thomson Reuters Eikon.

Shipping data showed it last sent a transponder signal at 2258 GMT Sunday and had since come to a halt 10-20 km (6-12 miles) off the east coast of the Pengerang peninsula in Johor, southern Malaysia.

An Alnic crew member contacted later by Reuters by telephone said there was no oil spill from the tanker, which was carrying almost 12,000 tonnes of fuel oil from Taiwan to discharge in Singapore.

“We have not discharged the tanker yet,” said the crew member, who asked not to be identified.

“We are proceeding to Raffles Reserved Anchorage, where the owners will investigate the matter. There was some damage to the valve but no oil spill.”

The Maritime and Port Authority of Singapore said no injuries were reported on the Alnic, which suffered some damage to its forepeak tank well above the waterline.

“There is no report of oil pollution and traffic in the Singapore Strait is unaffected,” the MPA said in a statement.

The waterways around Singapore are some of the busiest and most important in the world, carrying around a third of global shipping trade.

SISTER SHIPS

The collision is the second involving a US guided missile destroyer in the Pacific in nine weeks.

The US Navy said last week it had removed the two senior officers and the senior enlisted sailor on the USS Fitzgerald, which almost sank off the coast of Japan after it was struck by a Philippine container ship early on June 17.

That collision killed seven US sailors.

The USS Fitzgerald and USS John S. McCain are sister ships – both ballistic missile defence (BMD) capable ships and part of the same Japan-based destroyer squadron. The Seventh Fleet has six ships assigned to BMD patrols, with half of those out on patrol at any one time.

Asked whether the US Navy would need to bring forward other ships to maintain its strength, a spokesman for the Seventh Fleet said it was “way too early to know”.

The series of maritime mishaps in Asian waters comes at a tense time in the region. North Korea threatened last week to fire ballistic missiles towards the US Pacific territory of Guam, ratcheting up tensions with US President Donald Trump, who had threatened to unleash “fire and fury” on Pyongyang if it threatened the United States.

“Thoughts & prayers are w/ our @USNavy sailors aboard the #USSJohnSMcCain where search & rescue efforts are underway,” Trump said on Twitter late on Sunday.

The US Navy vessel involved in the latest collision is named for the father and grandfather of US Republican Senator John McCain, who were both admirals in the United States Navy.

Senator McCain is a Vietnam War-era naval pilot who was shot down and held prisoner for five-and-a-half years. He is now undergoing treatment for brain cancer.

“Cindy & I are keeping America’s sailors aboard the USS John S McCain in our prayers tonight – appreciate the work of search & rescue crews,” he said on Twitter.